NORTHBORO — A former police officer is under investigation for allegedly stealing more than $25,000 from the police union's bank account while he served as the group's president.

Nathan W. Fiske Sr., 33, of Holden resigned last Friday at the beginning of a disciplinary hearing with selectmen, according to Detective Jeffrey R. Noel, the current union president.

Detective Noel, in an interview this morning, said Mr. Fiske served as a dispatcher before being hired as a full-time police officer in 2007. He served as union president from September 2008 to May 2012, when he was voted out and Officer Noel was elected to succeed him.

Detective Noel said he and other union officials repeatedly asked Mr. Fiske for the union checkbook, but he never relinquished it.

When the union began preparing for contract negotiations earlier this year, Detective Noel went to the bank and had his and the other new union officers' names put on the account.

"I was shocked after we left the bank we noticed all of these transactions appeared to be non-union activities," Detective Noel said. "We thought he was a good cop before he did this. He betrayed us."

The detective said about 25 patrolmen, sergeants and dispatchers pay $12 a week union dues into the account.

An ongoing investigation is being conducted by the office of District Attorney Joseph D. Early Jr.

Contact Elaine Thompson at ethompson@telegram.com. Follow her on Twitter @EThompsonTG

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